2019 3500HD dual fuel tanks - Chevy and GMC Duramax Diesel Forum
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post #1 of 12 (permalink) Old 10-29-2018, 12:22 PM Thread Starter
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2019 3500HD dual fuel tanks

owners manual says nothing about this system at all. Does it make any difference which tank gets filled first?
From what I have found out, it uses a transfer pump in the rear tank to feed the front tank which feeds the engine. The only quantity sensor is in the front tank and it supposedly uses an algorithm to calculate total quantity.
Anybody have one of these systems on their truck? My previous 4 3500's were all single tank trucks.
Thanks for any guidance
John R Dunn
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post #2 of 12 (permalink) Old 10-29-2018, 03:13 PM
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First I've heard of dual tanks? What's the owner's manual say the total capacity is?

Maybe there are floats in each tank and the transfer pump keeps them even?

2002 Chevy 2500HD Crew - Original owner - 408,000 miles so far. All stock with the exception of a lift pump.
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post #3 of 12 (permalink) Old 10-29-2018, 05:45 PM
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Cab & Chassis models have dual tanks standard, 23 gallon front, 40 gallon rear.

2010 Gmc 2500 Duramax 853,500 Odometer miles - sold Nov 2018

2013 LT CCSB SRW bought with 508,000 miles, now over 674,000 miles

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post #4 of 12 (permalink) Old 10-29-2018, 09:15 PM
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Both is standard - and they are also available with just the 23 or just the 40.

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #5 of 12 (permalink) Old 11-06-2018, 09:18 AM Thread Starter
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Well, a little info on the dual tank system for anybodys info.

Front tank is 23.5 gals. and the rear is 40. You will find that the fuel quantity gauge reads both tanks by an algorithm. When mine shows 1/8 remaining, I filled the front first and it took 10.7 gals. The rear took 34 gals. The system uses a transfer pump to move the fuel to the front but will stop transferring when it reaches a certain level to not run the tank/lines dry. I don't think it makes a difference which tank you fill first as long as you don't have the truck running and try to fill the rear first-- it will try to transfer fuel to the front if it is low.
Also, the fuel filter is mounted in front of the REAR tank, not the front like a single tank truck.
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post #6 of 12 (permalink) Old 11-27-2019, 09:53 PM
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I have a 2016 Cab Chassis 3500 Crew Cab Duramax with just now 23k for miles.

I just had my first issue with my dual tank set up. I used to fill the front first but it always spit fuel back after 4 or 5 gallons so I just always filled the rear. I filled up yesterday as normal I typically don't shut off the engine when traveling unless I absolutely have. After filling up I drove about 10 miles then the engine threw a code DTC P2636. The check engine light came on, the DTC said low fuel and the gage dropped to Empty.
I called the local dealer as I was out of town traveling home and they were no help, finally called another dealer and he said to just keep the front tank full and I should make it home. So I stopped a couple times and squeezed in some fuel.

Took it to the dealer this morning and I asked about the recall on the fuel transfer that was done in June 18, about 10k miles ago. He said it was done I asked then what went wrong he said it was I did not shut the truck off and fuel the front tank that caused the problem. That does not make any sense to me, what sensor would know that I was fueling other than the gauge, and why would it matter what tank, as I was told that the recall was to by the pump.

Before this truck I had the exact truck except it was a 2006, it was dual tank etc.. I never had any issues with it but a turbo code on a trip to Maine and the dealer replaced it (turbo) around 92K.

Someone enlighten me.
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post #7 of 12 (permalink) Old 11-28-2019, 07:10 AM Thread Starter
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I think the second dealer didn't know how the system works. If GM didn't change it up I would think it would be like the ones I have. I don't shut down just to fuel and have had zero problems. I will fill the front first then the rear. If the front is low, and you fill the rear, once the transfer pump senses enough fuel it will start to send it to the front tank because it senses front low and will continue to send it until the front is full. On mine, if I had 1/8 showing on gage I filled front first then rear otherwise I just filled the rear.
Don't understand what went wrong with yours unless the transfer system quit or the gage is off. Post up what you figure out please.

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post #8 of 12 (permalink) Old 11-28-2019, 09:59 AM
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Interesting, Iíve found on my 2019 chassis cab that I have to fill the rear first and the front generally doesnít take as much fuel. I may try to fill the front next time, but generally even near 1/4 tank the front appears to be full.
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post #9 of 12 (permalink) Old 01-27-2020, 06:06 PM
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I just got a 2015 HD3500 cab Chassis and while driving it yesterday with the fuel gage showing a quarter of a tank the low fuel light came one and the gage dropped to empty. Also the check engine light came on. I put fuel in the rear tank and then today put fuel in the front tank but was able to get just a little in. I had the code checked and it was the P2636 code which is the was the transfer pump but it must still be working as the front tank still seemed full. Any ideas would be helpful. thanks, Steve
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post #10 of 12 (permalink) Old 01-27-2020, 08:24 PM
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same subject ,well sort of , I have a 2019 Chev crew cab 3500 Duramax how big is the fuel tank on it . Thanks Randy

2019 Chev Silverado LTZ Crew Cab 3500hd Duramax
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